From 2df9b984a1f73ec54cb546e3f57707ec22468392 Mon Sep 17 00:00:00 2001
From: "Tony J. White" <tjw@tjw.org>
Date: Fri, 19 Jan 2007 18:18:13 +0000
Subject: * rate limit the acknowledgment of gamestat messages in the master
 server   to prevent DoS

---
 src/master/messages.c | 13 ++++++++++---
 src/master/servers.h  |  4 ++++
 2 files changed, 14 insertions(+), 3 deletions(-)

(limited to 'src/master')

diff --git a/src/master/messages.c b/src/master/messages.c
index b30bc334..90fb223c 100644
--- a/src/master/messages.c
+++ b/src/master/messages.c
@@ -544,9 +544,16 @@ void HandleMessage (const char* msg, size_t length,
 		HandleGetMotd (msg + strlen (C2M_GETMOTD), address);
 	}
 
-	// If it's a game statistic
+  // If it's a game statistic
   else if( !strncmp( S2M_GAMESTAT, msg, strlen ( S2M_GAMESTAT ) ) )
-	{
-    HandleGameStat( msg + strlen( S2M_GAMESTAT ), address );
+  {
+    server = Sv_GetByAddr(address, qfalse);
+    if (server == NULL)
+	return;
+    if( crt_time - server->lastGameStat > MIN_GAMESTAT_DELAY )
+      HandleGameStat( msg + strlen( S2M_GAMESTAT ), address );
+    else
+      MsgPrint( MSG_NORMAL, "%s flooding GAMESTAT messages\n", peer_address );
+    server->lastGameStat = crt_time;
   }
 }
diff --git a/src/master/servers.h b/src/master/servers.h
index fbeef1c2..8165b66b 100644
--- a/src/master/servers.h
+++ b/src/master/servers.h
@@ -38,6 +38,9 @@
 #define CHALLENGE_MIN_LENGTH 9
 #define CHALLENGE_MAX_LENGTH 12
 
+// Minimum number of seconds between gamestat messages per server
+#define MIN_GAMESTAT_DELAY 120
+
 // ---------- Types ---------- //
 
 // Address mapping
@@ -63,6 +66,7 @@ typedef struct server_s
 	time_t challenge_timeout;
 	const struct addrmap_s* addrmap;
 	qboolean active;
+	time_t lastGameStat;
 } server_t;
 
 
-- 
cgit